> Western Medicines > Bisacodyl


Used for: Constipation
Chinese name:

What is Bisacodyl for?

Bisacodyl belongs to the class of medications called stimulant laxatives like Senna, which can stimulate a bowel movement by increasing the activity of the intestines. It is therefore commonly used to treat constipation or for bowel evacuation.

How to use it?

In Hong Kong, Bisacodyl is available in tablet and suppository form. Unless advised by a healthcare professional, Bisacodyl should not be used for more than 7 days. Otherwise, bowel dependence might occur.


The suggested dosages for different uses and age groups are listed below:


For constipation

Oral: 5-10 mg once daily at night
Rectal: 10 mg once daily in the morning


Child 4-17 years
Oral: 5-20 mg once daily at night


Child 2-17 years
Rectal: 5-10 mg once daily


For bowel evacuation

Initially take an oral dose of 10 mg twice daily in the morning and evening. Then, use a 10 mg suppository 1-2 hours before any procedure the following day.

What are the side effects of Bisacodyl?

Side effects of Bisacodyl are uncommon, but they can include abdominal cramps, nausea, and vomiting. If you are using Bisacodyl suppository, there might be anal irritation.

Who should not take Bisacodyl?

Pharmacist Tips:

  • If you are taking Bisacodyl tablets, there should be a bowel movement after about 8-12 hours. Note that a bowel movement is expected within 15-60 minutes after using a Bisacodyl suppository.
  • You should avoid taking Bisacodyl tablets within one hour of taking antacids, milk or milk products.

Common dosing schedule: 
Bisacodyl tablets can be taken with or without food. Tablets have a special coating, so they should not be crushed, split, or chewed.


This schedule is for reference only, adjustments may be made according to individual needs.


Some common medications Bisacodyl may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Bisacodyl in Hong Kong?

In Hong Kong, Bisacodyl is an over-the-counter medicine that can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.


For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Bisacodyl in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.

Brands in Hong Kong
Available dosage
  • 5mg / 10mg (Gastro-Resistant Tablets)
  • 10mg (Suppositories)
Drug class
Sub class
Stimulant Laxatives
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